I need to order 3 replacements balancers, all the same.
A quick learner from Richmond, California says:
March 20, 2015
The metal channel is 1/2" wide, 1/2" deep and 20" long, (without fittings). this is for a non-tilt window. The back is marked 19 4 BO, (or B0), CALDWELL.
Tom from SWISCO responded:
March 23, 2015
Thank you for the clear images! I recommend our S385-20 channel balance, which comes with a 19-005 top and 15-004 bottom. Please review this hardware and let me know what you think! I also recommend our 1940 stamp option.